static dropbear for live digital forensics

build_static_dropbear

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+#!/bin/bash
+
+# Usage:       ./build_static_dropbear
+#                or
+#              bash build_static_dropbear
+# Description: Download newest stable dropbear release and
+#                compiles static binaries (client, server and scp)
+# Author:      Patrick Neumann (patrick@neumannsland.de)
+# Platform:    Debian or Raspbian GNU/Linux (tested: 9.5)
+# Version:     1.0
+# Date:        06.07.2018
+# License:     GPL3
+# Warranty:    This program is distributed WITHOUT ANY WARRANTY
+
+# autodetect arch:
+ARCH="$( /bin/uname --machine )"
+
+# autodetect release or do it manualy:
+RELEASE="$( /usr/bin/curl --silent https://matt.ucc.asn.au/dropbear/dropbear.html \
+            | /bin/grep --extended-regexp "Latest is [[:digit:]]{4}\.[[:digit:]]{1,3}" \
+            | /bin/grep --extended-regexp --only-matching "[[:digit:]]{4}\.[[:digit:]]{1,3}" )"
+#RELEASE="2018.76"
+/usr/bin/test -n "${RELEASE}" || ( echo "Release detection failed - please edit script manually" ; exit 1 )
+
+# dependencies (static libs):
+if [ ! -f /usr/share/build-essential/list ] ; then /usr/bin/sudo /usr/bin/apt install build-essential --assume-yes ; fi
+if [ ! -f /usr/lib/*-linux-gnu*/libc.a ] ; then /usr/bin/sudo /usr/bin/apt install libc6-dev --assume-yes ; fi
+if [ ! -f /usr/lib/*-linux-gnu*/zlib.a ] ; then /usr/bin/sudo /usr/bin/apt install zlib1g-dev --assume-yes ; fi
+
+# downloading...
+/usr/bin/wget https://matt.ucc.asn.au/dropbear/releases/dropbear-${RELEASE}.tar.bz2
+
+# extracting...
+/bin/tar xjf dropbear-${RELEASE}.tar.bz2
+
+# compiling and stripping...
+cd dropbear-${RELEASE}
+./configure --enable-static \
+            --disable-syslog \
+            --disable-lastlog \
+            --disable-utmp \
+            --disable-utmpx \
+            --disable-wtmp \
+            --disable-wtmpx
+/usr/bin/make PROGRAMS="dropbear dbclient scp"
+/usr/bin/make strip
+
+# rename binary:
+BINARY1="dbclient-${ARCH}-${RELEASE}"
+/bin/mv dbclient "${BINARY1}"
+BINARY2="scp-${ARCH}-${RELEASE}"
+/bin/mv scp "${BINARY2}"
+BINARY3="dropbear-${ARCH}-${RELEASE}"
+/bin/mv dropbear "${BINARY3}"
+
+# final instructions:
+echo
+echo "Ready to copy:"
+echo
+echo "  cp $PWD/${BINARY1} /media/POLICE/"
+echo "  cp $PWD/${BINARY2} /media/POLICE/"
+echo "  cp $PWD/${BINARY3} /media/POLICE/"
+echo
+
+exit 0